Department of Civil Engineering, Tsinghua University, Beijing 100084, People's Republic of China.
J Hazard Mater. 2011 Feb 28;186(2-3):1070-5. doi: 10.1016/j.jhazmat.2010.11.109. Epub 2010 Dec 3.
This study aims to investigate the ways to improve the cementitious properties of steel slag. The results show that the cementitious phase of steel slag is composed of silicate and aluminate, but the large particles of these phases make a very small contribution to the cementitious properties of steel slag. RO phase (CaO-FeO-MnO-MgO solid solution), Fe(3)O(4), C(2)F and f-CaO make no contribution to the cementitious properties of steel slag. A new kind of steel slag with more cementitious phase and less RO phase can be obtained by removing some large particles. This new steel slag possesses better cementitious properties than the original steel slag. The large particles can be used as fine aggregates for concrete. Adding regulating agent high in CaO and SiO(2) during manufacturing process of steel slag to increase the cementitious phase to inert phase ratio is another way to improve its cementitious properties. The regulating agent should be selected to adapt to the specific steel slag and the alkalinity should be increased as high as possible on the premise that the f-CaO content does not increase. The cooling rate should be enhanced to improve the hydration activity of the cementitious phase at the early ages and the grindability of steel slag.
本研究旨在探讨提高钢渣胶凝性能的方法。结果表明，钢渣的胶凝相由硅酸盐和铝酸盐组成，但这些相的大颗粒对钢渣的胶凝性能贡献很小。RO 相（CaO-FeO-MnO-MgO 固溶体）、Fe(3)O(4)、C(2)F 和 f-CaO 对钢渣的胶凝性能没有贡献。通过去除一些大颗粒，可以获得一种具有更多胶凝相和更少 RO 相的新型钢渣。这种新型钢渣具有比原始钢渣更好的胶凝性能。大颗粒可用作混凝土的细骨料。在钢渣的制造过程中添加高钙和高硅的调节剂，以增加胶凝相和惰性相的比例，也是提高其胶凝性能的另一种方法。调节剂的选择应适应特定的钢渣，并在不增加 f-CaO 含量的前提下尽可能提高碱度。应提高冷却速率，以提高早期胶凝相的水化活性和钢渣的易磨性。
